REDWOOD CITY, Calif.--March 8, 2006--Tumbleweed(R) Communications Corp. (NASDAQ?), a leading provider of email security, managed file transfer, and identity validation appliance and software products, today announced that the Tumbleweed MailGate(R) Edge and MailGate Email Firewall have received a Checkmark PREMIUM Anti-Spam Certification from West Coast Labs, according to the organization's most recent Anti-Spam Solutions Technology Report.

Tumbleweed received the Checkmark PREMIUM rating, the highest rating awarded by West Coast Labs. Tumbleweed's spam capture rate of 98 percent with zero false positives demonstrates the ability to block nearly all spam while ensuring legitimate emails are not blocked or lost using the Tumbleweed MailGate Edge(TM) and MailGate Email Firewall(TM) solutions. The entire report can be found at: www.tumbleweed.com/pdfs/spam_tumbleweed.pdf

"We are extremely pleased that yet another independent testing lab has recognized the combination of power, performance and usability that the Tumbleweed MailGate product suite offers in the fight against the growing spam problem," said John Thielens, CTO of Tumbleweed Communications. "Tumbleweed is committed to providing its customers with the most effective email security solutions available. The Checkmark PREMIUM rating is a testament to this commitment, and further validation of MailGate's effectiveness."

The West Coast Labs Technology Reports feature independent technical analysis of each solution tested to pre-published methods and reviewed against the functionality criteria of the Checkmark certification program. This ensures that all the products are tested against real-world standards and establishes how each performs in a simulated business environment. The Anti-Spam Solutions Technology Report addressed the issues of management/administration, functionality and performance as the key criteria for the Anti-Spam tests.

About West Coast Labs
West Coast Labs is an independent organization which tests and validates the functionality and performance of information security products. West Coast Labs has also developed the Checkmark certification system into one of the world's foremost certification programs -- an integrated system of standards that are recognized around the world as reliable indicators of performance levels. For more information, visit: www.westcoastlabs.org .

About Tumbleweed Communications Corp.
Tumbleweed provides security solutions for email protection, file transfers, and identity validation that allow organizations to safely conduct business over the Internet. Tumbleweed offers these solutions in three comprehensive product suites: MailGate, SecureTransport(TM), and Validation Authority(TM). MailGate provides protection against spam, viruses, and attacks, and enables policy-based message filtering, encryption, and routing. SecureTransport enables business to safely exchange large files and transactions without proprietary software. Validation Authority is the world-leading solution for determining the validity of digital certificates. Tumbleweed's enterprise and government customers include ABN Amro, Bank of America Securities, Catholic Healthcare West, JP Morgan Chase & Co., The Regence Group (Blue Cross/Blue Shield), St. Luke's Episcopal Healthcare System, the U.S. Food and Drug Administration, the U.S. Department of Defense, and all four branches of the U.S. Armed Forces. Tumbleweed was founded in 1993 and is headquartered in Redwood City, Calif. For additional information about Tumbleweed go to www.tumbleweed.com

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